Added a Load function to StartGame.

Can now load a previously saved game from disk.

UOP1_Project/Assets/Scenes/Menus/MainMenu.unity

   locationsToLoad:
   - {fileID: 11400000, guid: 2f386bbc670c05145834a0f9c7d55798, type: 2}
   showLoadScreen: 1
+  saveSystem: {fileID: 11400000, guid: edc355c4a7d5028408d322b90814e19e, type: 2}
 --- !u!1 &2140469179
 GameObject:
   m_ObjectHideFlags: 0

UOP1_Project/Assets/Scripts/SaveSystem/SaveSystem.cs

-using UnityEngine;
+using System.Collections;
+using UnityEngine;
+using UnityEngine.AddressableAssets;
+using UnityEngine.ResourceManagement.AsyncOperations;
 
 public class SaveSystem : ScriptableObject
 {
 			saveData._locationId = locationSo.Guid;
 		}
 
-		SaveGame();
+		SaveDataToDisk();
-	public void LoadGame()
+	public void LoadSaveDataFromDisk()
 	{
 		if (FileManager.LoadFromFile(saveFilename, out var json))
 		{
 
+	public IEnumerator LoadSavedInventory()
+	{
+		_playerInventory.Items.Clear();
+		foreach (var serializedItemStack in saveData._itemStacks)
+		{
+			var loadItemOperationHandle = Addressables.LoadAssetAsync<Item>(serializedItemStack.itemGuid);
+			yield return loadItemOperationHandle;
+			if (loadItemOperationHandle.Status == AsyncOperationStatus.Succeeded)
+			{
+				var itemSo = loadItemOperationHandle.Result;
+				_playerInventory.Add(itemSo, serializedItemStack.amount);
+			}
+		}
+	}
-	public void SaveGame()
+	public void SaveDataToDisk()
 	{
 		saveData._itemStacks.Clear();
 		foreach (var itemStack in _playerInventory.Items)

UOP1_Project/Assets/Scripts/SceneManagement/StartGame.cs

-using UnityEngine;
+using System.Collections;
+using UnityEngine;
+using UnityEngine.AddressableAssets;
+using UnityEngine.ResourceManagement.AsyncOperations;
-
 public class StartGame : MonoBehaviour
 {
 	public LoadEventChannelSO onPlayButtonPress;
+	public SaveSystem saveSystem;
+
+	}
+
+	public void OnLoadButtonPress()
+	{
+		StartCoroutine(LoadSaveGame());
+	}
+
+	public IEnumerator LoadSaveGame()
+	{
+		saveSystem.LoadSaveDataFromDisk();
+		yield return StartCoroutine(saveSystem.LoadSavedInventory());
+
+		var locationGuid = saveSystem.saveData._locationId;
+		var asyncOperationHandle = Addressables.LoadAssetAsync<LocationSO>(locationGuid);
+		yield return asyncOperationHandle;
+		if (asyncOperationHandle.Status == AsyncOperationStatus.Succeeded)
+		{
+			var locationSo = asyncOperationHandle.Result;
+			onPlayButtonPress.RaiseEvent(new[] {(GameSceneSO)locationSo}, showLoadScreen);
+		}
 	}
 }